In bowl, whisk together flour, baking powder, sugar, baking soda and salt. Using pastry cutter, cut in butter until mixture resembles coarse crumbs. With fork, stir in cheese and chives; stir in yogurt to form soft dough.

Bake on parchment paper–lined baking sheet in centre of 425°F (220°C) oven for 12 to 14 minutes or until golden. Serve warm. (Make-ahead: Store in airtight container for up to 24 hours; warm in 350°F/ 180°C oven for 5 minutes.)